US20220388138A1 - Oscillating multi-tool - Google Patents
Oscillating multi-tool Download PDFInfo
- Publication number
- US20220388138A1 US20220388138A1 US17/749,765 US202217749765A US2022388138A1 US 20220388138 A1 US20220388138 A1 US 20220388138A1 US 202217749765 A US202217749765 A US 202217749765A US 2022388138 A1 US2022388138 A1 US 2022388138A1
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- United States
- Prior art keywords
- axis
- counterweight
- case
- housing
- power tool
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000010355 oscillation Effects 0.000 claims abstract description 9
- 230000004044 response Effects 0.000 claims abstract description 9
- 230000007246 mechanism Effects 0.000 claims description 24
- 230000007935 neutral effect Effects 0.000 claims description 8
- 238000009423 ventilation Methods 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
- B25D17/24—Damping the reaction force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/007—Weight compensation; Temperature compensation; Vibration damping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
- B24B23/04—Portable grinding machines, e.g. hand-guided; Accessories therefor with oscillating grinding tools; Accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
- B25F5/006—Vibration damping means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B19/00—Other reciprocating saws with power drive; Fret-saws
- B27B19/006—Other reciprocating saws with power drive; Fret-saws with oscillating saw blades; Hand saws with oscillating saw blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D79/00—Methods, machines, or devices not covered elsewhere, for working metal by removal of material
- B23D79/02—Machines or devices for scraping
- B23D79/06—Machines or devices for scraping with reciprocating cutting-tool
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
- B25D2217/0073—Arrangements for damping of the reaction force
- B25D2217/0076—Arrangements for damping of the reaction force by use of counterweights
- B25D2217/0092—Arrangements for damping of the reaction force by use of counterweights being spring-mounted
Definitions
- the present disclosure relates to power tools, and more particularly to oscillating multi-tools.
- the present invention relates to power tools driven by an electric motor.
- Power tools utilize the rotation of a motor to provide useful torque for operations such as cutting, sanding, grinding, removing material, drilling, driving fasteners, and the like.
- One example of a power tool is an oscillating multi-tool. Oscillating multi-tools can be utilized with various accessories, such as blades and sanding or grinding pad attachments, for performing different functions.
- the present invention provides, in one aspect, a power tool including a housing, a motor that is disposed within the housing and defining a first axis, and a tool holder driven to oscillate about a second axis by the motor.
- the second axis is perpendicular to the first axis.
- the power tool also includes a vibration dampening assembly with a counterweight that is configured to reciprocate along a third axis that is perpendicular to both the first axis and the second axis in response to oscillation of the tool holder about the second axis.
- the vibration dampening assembly further includes a first spring adjacent a first end of the counterweight and a second spring adjacent an opposite, second end of the counterweight. The first and second springs bias the counterweight toward a neutral position.
- the vibration dampening assembly further includes a case in which the counterweight is located.
- the case is internally located within the housing or externally located of the housing.
- the case includes a ventilation port configured to communicate an interior of the case in which the counterweight is located with the atmosphere outside the case.
- the invention provides, in another aspect, a power tool including a housing, a motor disposed within the housing and defining a first axis, and a tool holder driven to oscillate about a second axis by the motor.
- the second axis being perpendicular to the first axis.
- the power tool also includes a drive mechanism configured to convert torque from the motor to an oscillating movement of a tool accessory received by the tool holder and a vibration dampening assembly including a counterweight configured to reciprocate along a third axis perpendicular to both the first axis and the second axis in response to oscillation of the tool holder about the second axis.
- the invention provides, in another aspect, a power tool including a housing, a motor disposed within the housing and defining a first axis, and a tool holder driven to oscillate about a second axis by the motor.
- the second axis being perpendicular to the first axis.
- the power tool also includes a vibration dampening assembly having a case supported by the housing and a counterweight positioned within the case.
- the counterweight is configured to reciprocate along a third axis perpendicular to both the first axis and the second axis in response to oscillation of the tool holder about the second axis.
- the vibration dampening assembly also includes a first spring arranged between the case and the counterweight and a second spring arranged between the case and the counterweight. The first spring biases the counterweight in a first direction and the second spring biases the counterweight in a second direction opposite the first direction. The first and second springs bias the counterweight toward a neutral position within the case.
- FIG. 1 is a top perspective view of an oscillating multi-tool in accordance with an embodiment of the invention.
- FIG. 2 is a cross-sectional view of a portion of the multi-tool shown in FIG. 1 .
- FIG. 3 is a perspective view of a vibration dampening assembly for use with the multi-tool of FIG. 1 .
- FIG. 4 is an exploded view of the vibration dampening assembly of FIG. 3 .
- FIG. 5 is a cross-sectional view of the vibration dampening module of FIG. 3 .
- FIG. 6 is a perspective view of a case of another embodiment of the vibration dampening assembly of FIG. 3 .
- FIG. 7 is a perspective view of another embodiment of a vibration dampening assembly for use with the multi-tool of FIG. 1 .
- FIG. 8 is an exploded view of the vibration dampening assembly of FIG. 7 .
- FIG. 9 is a cross-sectional view of the vibration dampening assembly of FIG. 7 .
- FIGS. 1 and 2 illustrate a power tool, such as an oscillating multi-tool 10 , including a housing 12 , a motor 14 , a drive mechanism 16 that converts torque received from the motor 14 to an oscillating movement of a tool accessory 18 about an axis B, and a power source, such as a battery pack 22 , for powering the motor 14 .
- the multi-tool 10 may be powered by an AC power source by way of a cord (not shown).
- the housing 12 includes two clamshell halves 24 a , 24 b that are coupled together to enclose the motor 14 and the drive mechanism 16 .
- the clamshell halves 24 a , 24 b define a handle portion 26 and a battery support portion 28 of the housing 12 to which the battery pack 22 is attached.
- the handle portion 26 is configured to be grasped by a user during operation of the power tool 10 .
- An actuator 30 is located on the handle portion 26 of the housing 12 for switching the motor 14 between an “on” state and an “off” state.
- a separate actuator may be employed for changing the rotational speed of the motor 14 .
- the actuator 30 may additionally be operable to vary the rotational speed of the motor 14 in addition to switching the motor 14 between the “on” and “off” states.
- the motor 14 and the drive mechanism 16 are positioned within the housing 12 in front of the handle portion 26 .
- the drive mechanism 16 is positioned within a gear case 32 attached to the housing 12 ( FIG. 2 ).
- the motor 14 includes a drive shaft 34 , which provides a continuous torque input to the drive mechanism 16 when the motor 14 is in the “on” state.
- the drive mechanism 16 converts the continuous torque input from the drive shaft 34 into oscillating rotational motion of the tool accessory 18 about the axis B.
- the tool accessory 18 is coupled to an output shaft, or spindle 36 , of the drive mechanism 16 .
- the spindle 36 defines the axis B, which is perpendicular to a longitudinal axis A defined by the housing 12 and the motor 14 ( FIG. 2 ).
- the motor 14 drives the drive mechanism 16 to oscillate the spindle 36 and the tool accessory 18 about the axis B.
- the tool accessory 18 is a cutting blade.
- the tool accessory 18 may be a different type of blade such as a scraper blade, a circular blade, a semi-circular blade, etc., or a different type of element such as a sanding pad, a grinding element, etc.
- the multi-tool 10 includes a clamping mechanism 20 for securing the tool accessory 18 to the spindle 36 .
- the clamping mechanism 20 does not require the use of tools to attach, remove, and exchange tool accessories.
- the clamping mechanism 20 includes a plunger 38 , a spring 40 , a tool holder 42 coupled for co-rotation with the spindle 36 , and a fastener 44 , which will be described in greater detail below.
- a lever 46 is pivotable by a user to operate the clamping mechanism 20 .
- the lever 46 is pivotable about a pin 48 , which defines a pivot axis C, between a clamping position ( FIG. 2 ) and a release position (not shown).
- a clamping position In the clamping position, the tool accessory 18 is secured, or clamped, to the tool holder 42 .
- the fastener 44 In the release position, the fastener 44 may be unthreaded from the plunger 38 to remove and/or exchange the tool accessory 18 .
- the lever 46 includes a cam 50 for displacing the plunger 38 . In the clamping position, the cam 50 does not engage the plunger 38 . In the release position, the cam 50 engages the plunger 38 to displace the plunger 38 against the bias of the spring 40 .
- a user may rotate the lever 46 about the pivot axis C, causing the cam 50 to engage and displace the plunger 38 , which releases the clamping force applied to the tool accessory 18 and allows the fastener 44 and the tool accessory 18 to be removed.
- a user may then exchange the tool accessory 18 and thread the fastener 44 into the plunger 38 so that the tool accessory 18 reengages the tool holder 42 .
- a user can rotate the lever 46 back to the clamping position, permitting the spring 40 to rebound and displace the plunger 38 and the connected fastener 44 toward the pivot axis C, which applies a clamping force between the tool holder 42 and the tool accessory 18 .
- FIGS. 3 - 5 illustrate a vibration dampening assembly 54 for use with the multi-tool 10 .
- the vibration dampening assembly 54 attenuates vibration created by the multi-tool 10 during operation.
- the vibration dampening assembly 54 may be coupled to the housing 12 with a hose clamp, fasteners, or an adhesive.
- the vibration dampening assembly 54 may be integrated with the housing 12 .
- the vibration dampening assembly 54 may be coupled to the exterior of the housing 12 .
- the vibration dampening assembly 54 may be disposed within the interior of the housing 12 .
- the vibration dampening assembly 54 may be supported within the gear case 32 .
- the vibration dampening assembly 54 includes a case 58 , a counterweight 62 disposed within the case 58 , two end caps 66 a , 66 b , and two compression springs 70 a , 70 b positioned on opposite sides of the counterweight 62 .
- the case 58 is generally cylindrical and includes a first end 74 and a second end 78 opposite the first end 74 .
- the case 58 defines a bore 82 that extends between the first and second ends 74 , 78 .
- the case 58 also includes a bracket 86 that may be used to mount the vibration dampening assembly 54 to the housing 12 .
- the case 58 may be integrally formed with the clamshell halves 24 a , 24 b or omitted entirely with the counterweight 62 being suspended within the housing 12 .
- the case 58 , end caps 66 a , 66 b , and/or the counterweight 62 may be produced using an additive manufacturing process, such as 3D printing, and may be made from plastic, metal, or other suitable materials.
- the counterweight 62 is also generally cylindrical and defines a first end 90 and a second end 94 opposite the first end 90 .
- the first end 90 of the counterweight 62 defines a first spring seat 98 to receive an end of the spring 70 a and the second end 94 defines a second spring seat 102 to receive an end of the other spring 70 b .
- a first end cap 66 a is coupled to the first end 74 of the case 58 and a second end cap 66 b is coupled to the second end 78 of the case 58 .
- the first and second end caps 66 a , 66 b enclose the counterweight 62 and springs 70 within the bore 82 of the case 58 .
- Each end cap 66 a , 66 b includes a spring seat 106 that receives an end of one of the springs 70 a , 70 b .
- one of the end caps 66 a , 66 b may be integrated with the case 58 .
- the first spring 70 a is positioned between the spring seat 106 of the first end cap 66 a and the first spring seat 98 of the counterweight 62 .
- the second spring 70 b is positioned between the spring seat 106 of the second end cap 66 b and the second spring seat 102 of the counterweight 62 .
- the counterweight 62 reciprocates along an axis D, which is perpendicular to both of the axes A, B.
- the axis D is parallel with the pivot axis C.
- the first spring 70 a biases the counterweight 62 in a first direction
- the second spring 70 b biases the counterweight 62 in a second direction that is opposite the first direction.
- the first and second springs 70 a , 70 b have identical stiffnesses; therefore, the counterweight 62 is biased towards a neutral position between the end caps 66 a , 66 b when the motor 14 is in the “off” state and the tool accessory 18 is not oscillating.
- the first and second springs 70 a , 70 b suspend the counterweight 62 within the bore 82 so that the counterweight 62 can freely oscillate within the bore 82 without frictional contact with the interior of the case 58 .
- the counterweight 62 includes a smaller diameter than the bore 82 of the case 58 to inhibit the counterweight 62 from contacting the case 58 .
- the mass of the counterweight 62 and the stiffness of the springs 70 a , 70 b can be selected (i.e., tuned) to substantially dampen the vibration created by the oscillating movement of the drive mechanism 16 and the tool accessory 18 when the motor 14 is in the “on” state.
- the vibration dampening assembly 54 may include more than two springs.
- the vibration dampening assembly 54 attenuates this vibration.
- the drive mechanism 16 converts a continuous torque input from the motor 14 to oscillating rotation of the drive mechanism 16 and tool accessory 18 about the axis B.
- a reaction torque is applied to the housing 12 in an opposite, second rotational direction about axis B.
- the spindle 36 , the tool holder 42 , and the tool accessory 18 then stop rotating in the first rotational direction, and their rotation is reversed to the second rotational direction.
- a reaction torque is applied to the housing 12 in the first rotational direction about axis B.
- the oscillating reaction torque applied to the housing 12 creates the vibration felt by the user.
- the vibration dampening assembly 54 is offset from the axis B, with the reciprocating axis D of the counterweight 62 oriented transverse to the axis B, to create equal and opposite moments about the axis B to counteract the reversing reaction torque applied to the housing 12 .
- the counterweight 62 reciprocates along the axis D out of phase with the oscillation of the drive mechanism 16 and the tool accessory 18 to counteract the reversing reaction torque.
- the springs 70 a , 70 b of the vibration dampening assembly 54 continually bias the counterweight 62 toward a neutral position.
- the reciprocating movement of the counterweight 62 reduces the magnitude of the vibration transmitted through the housing 12 and handle portion 26 to the user as the spindle 36 , the tool holder 42 , and the tool accessory 18 oscillate.
- FIG. 6 illustrates a case 110 of a vibration dampening assembly in accordance with another embodiment.
- the case 110 is similar to the case 58 but includes a slot 114 that extends into the bore 82 .
- the slot 114 ventilates the interior of the case 110 to prevent accumulated air pressure from affecting reciprocation of the counterweight 62 .
- FIGS. 7 - 9 illustrate a vibration dampening assembly 210 , in accordance with another embodiment of the invention, for use with the multi-tool 10 of FIG. 1 .
- the vibration dampening assembly 210 is similar to the vibration dampening assembly 54 with like features being represented with like references numerals.
- the vibration dampening assembly 210 includes a case 214 , a counterweight 62 , and first and second springs 70 a , 70 b ( FIGS. 8 and 9 ).
- the case 214 includes an end cap 216 and a flange 218 .
- the flange 218 includes an indentation 222 that defines a spring seat 226 for the second spring 70 b .
- the end cap 216 includes an interior 230 ( FIG. 9 ) having a first cavity portion 234 and a second cavity portion 238 that has a smaller diameter than the first cavity portion 234 .
- the second cavity portion 238 defines a spring seat 242 for the first spring 70 a .
- Both the end cap 216 and the flange 218 include a plurality of bosses 246 extending from respective outer surfaces.
- a fastener 250 may be inserted through apertures in the bosses 246 to secure the end cap 216 to the flange 218 .
- the fasteners 250 include a threaded bolt and a nut. In other embodiments, different types of fasteners may be used.
- the case 214 when assembled, the case 214 defines an enclosed chamber 254 in which the counterweight 62 and the springs 70 a , 70 b are located.
- the first spring 70 a is positioned between the spring seat 242 of the flange 218 and the first spring seat 98 of the counterweight 62 .
- the second spring 70 b is positioned between the spring seat 226 of the end cap 216 and the second spring seat 102 of the counterweight 62 . Similar to the vibration dampening assembly 54 , the first spring 70 a biases the counterweight 62 in a first direction, whereas the second spring 70 b biases the counterweight 62 in a second direction that is opposite the first direction.
- the first and second springs 70 a , 70 b have identical stiffnesses; therefore, the counterweight 62 is biased towards a neutral position between the spring seats 226 , 242 when the motor 14 is in the “off” state.
- the first and second springs 70 a , 70 b suspend the counterweight 62 within the second cavity portion 238 of the case 214 so that the counterweight 62 can freely oscillate within the second cavity portion 238 without frictional contact with the interior of the case 214 .
- the counterweight 62 includes a smaller diameter than the second cavity portion 238 to inhibit the counterweight 62 from contacting the case 214 .
- the vibration dampening assembly 210 attenuates this vibration.
- the drive mechanism 16 converts a continuous torque input from the motor 14 to oscillating rotation of the drive mechanism 16 and the tool accessory 18 about the axis B.
- a reaction torque is applied to the housing 12 in an opposite, second rotational direction about axis B.
- the spindle 36 , the tool holder 42 , and the tool accessory 18 then stop rotating in the first rotational direction, and their rotation is reversed to the second rotational direction.
- a reaction torque is applied to the housing 12 in the first rotational direction about axis B.
- the oscillating reaction torque applied to the housing 12 creates the vibration felt by the user.
- the vibration dampening assembly 210 is offset from the axis B, with the reciprocating axis D of the counterweight 62 oriented transverse to the axis B, to create equal and opposite moments about the axis B to counteract the reversing reaction torque applied to the housing 12 .
- the counterweight 62 reciprocates along the axis D out of phase with the oscillation of the drive mechanism 16 and the tool accessory 18 to counteract the reversing reaction torque.
- the springs 70 a , 70 b of the vibration dampening assembly 210 continually bias the counterweight 62 toward a neutral position.
- the reciprocating movement of the counterweight 62 reduces the magnitude of the vibration transmitted through the housing 12 and handle portion 26 to the user as the spindle 36 , the tool holder 42 , and the tool accessory 18 oscillate.
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- Percussive Tools And Related Accessories (AREA)
Abstract
A power tool includes a housing, a motor that is disposed within the housing and defining a first axis, and a tool holder driven to oscillate about a second axis by the motor. The second axis is perpendicular to the first axis. The power tool also includes a vibration dampening assembly with a counterweight that is configured to reciprocate along a third axis that is perpendicular to both the first axis and the second axis in response to oscillation of the tool holder about the second axis.
Description
- This application claims the benefit of U.S. Provisional Patent Application No. 63/191,565 filed on May 21, 2021, the entire content of which is incorporated herein by reference.
- The present disclosure relates to power tools, and more particularly to oscillating multi-tools.
- The present invention relates to power tools driven by an electric motor. Power tools utilize the rotation of a motor to provide useful torque for operations such as cutting, sanding, grinding, removing material, drilling, driving fasteners, and the like. One example of a power tool is an oscillating multi-tool. Oscillating multi-tools can be utilized with various accessories, such as blades and sanding or grinding pad attachments, for performing different functions.
- The present invention provides, in one aspect, a power tool including a housing, a motor that is disposed within the housing and defining a first axis, and a tool holder driven to oscillate about a second axis by the motor. The second axis is perpendicular to the first axis. The power tool also includes a vibration dampening assembly with a counterweight that is configured to reciprocate along a third axis that is perpendicular to both the first axis and the second axis in response to oscillation of the tool holder about the second axis.
- In another aspect, the vibration dampening assembly further includes a first spring adjacent a first end of the counterweight and a second spring adjacent an opposite, second end of the counterweight. The first and second springs bias the counterweight toward a neutral position.
- In another aspect, the vibration dampening assembly further includes a case in which the counterweight is located.
- In a further aspect, the case is internally located within the housing or externally located of the housing.
- In another aspect, the case includes a ventilation port configured to communicate an interior of the case in which the counterweight is located with the atmosphere outside the case.
- The invention provides, in another aspect, a power tool including a housing, a motor disposed within the housing and defining a first axis, and a tool holder driven to oscillate about a second axis by the motor. The second axis being perpendicular to the first axis. The power tool also includes a drive mechanism configured to convert torque from the motor to an oscillating movement of a tool accessory received by the tool holder and a vibration dampening assembly including a counterweight configured to reciprocate along a third axis perpendicular to both the first axis and the second axis in response to oscillation of the tool holder about the second axis.
- The invention provides, in another aspect, a power tool including a housing, a motor disposed within the housing and defining a first axis, and a tool holder driven to oscillate about a second axis by the motor. The second axis being perpendicular to the first axis. The power tool also includes a vibration dampening assembly having a case supported by the housing and a counterweight positioned within the case. The counterweight is configured to reciprocate along a third axis perpendicular to both the first axis and the second axis in response to oscillation of the tool holder about the second axis. The vibration dampening assembly also includes a first spring arranged between the case and the counterweight and a second spring arranged between the case and the counterweight. The first spring biases the counterweight in a first direction and the second spring biases the counterweight in a second direction opposite the first direction. The first and second springs bias the counterweight toward a neutral position within the case.
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FIG. 1 is a top perspective view of an oscillating multi-tool in accordance with an embodiment of the invention. -
FIG. 2 is a cross-sectional view of a portion of the multi-tool shown inFIG. 1 . -
FIG. 3 is a perspective view of a vibration dampening assembly for use with the multi-tool ofFIG. 1 . -
FIG. 4 is an exploded view of the vibration dampening assembly ofFIG. 3 . -
FIG. 5 is a cross-sectional view of the vibration dampening module ofFIG. 3 . -
FIG. 6 is a perspective view of a case of another embodiment of the vibration dampening assembly ofFIG. 3 . -
FIG. 7 is a perspective view of another embodiment of a vibration dampening assembly for use with the multi-tool ofFIG. 1 . -
FIG. 8 is an exploded view of the vibration dampening assembly ofFIG. 7 . -
FIG. 9 is a cross-sectional view of the vibration dampening assembly ofFIG. 7 . - Before any embodiments of the disclosure are explained in detail, it is to be understood that the disclosure is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
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FIGS. 1 and 2 illustrate a power tool, such as an oscillating multi-tool 10, including ahousing 12, amotor 14, adrive mechanism 16 that converts torque received from themotor 14 to an oscillating movement of atool accessory 18 about an axis B, and a power source, such as abattery pack 22, for powering themotor 14. In some embodiments, the multi-tool 10 may be powered by an AC power source by way of a cord (not shown). - With reference to
FIG. 1 , thehousing 12 includes twoclamshell halves motor 14 and thedrive mechanism 16. When connected, theclamshell halves handle portion 26 and abattery support portion 28 of thehousing 12 to which thebattery pack 22 is attached. Thehandle portion 26 is configured to be grasped by a user during operation of thepower tool 10. Anactuator 30 is located on thehandle portion 26 of thehousing 12 for switching themotor 14 between an “on” state and an “off” state. In some embodiments, a separate actuator may be employed for changing the rotational speed of themotor 14. In other embodiments, theactuator 30 may additionally be operable to vary the rotational speed of themotor 14 in addition to switching themotor 14 between the “on” and “off” states. - The
motor 14 and thedrive mechanism 16 are positioned within thehousing 12 in front of thehandle portion 26. In the illustrated embodiment, thedrive mechanism 16 is positioned within agear case 32 attached to the housing 12 (FIG. 2 ). Themotor 14 includes a drive shaft 34, which provides a continuous torque input to thedrive mechanism 16 when themotor 14 is in the “on” state. Thedrive mechanism 16 converts the continuous torque input from the drive shaft 34 into oscillating rotational motion of thetool accessory 18 about the axis B. - The
tool accessory 18 is coupled to an output shaft, orspindle 36, of thedrive mechanism 16. In the illustrated embodiment, thespindle 36 defines the axis B, which is perpendicular to a longitudinal axis A defined by thehousing 12 and the motor 14 (FIG. 2 ). When in the “on” state, themotor 14 drives thedrive mechanism 16 to oscillate thespindle 36 and thetool accessory 18 about the axis B. In the illustrated embodiment, thetool accessory 18 is a cutting blade. However, in other embodiments, thetool accessory 18 may be a different type of blade such as a scraper blade, a circular blade, a semi-circular blade, etc., or a different type of element such as a sanding pad, a grinding element, etc. - With continued reference to
FIG. 2 , the multi-tool 10 includes aclamping mechanism 20 for securing thetool accessory 18 to thespindle 36. In the illustrated embodiment, theclamping mechanism 20 does not require the use of tools to attach, remove, and exchange tool accessories. Theclamping mechanism 20 includes aplunger 38, aspring 40, atool holder 42 coupled for co-rotation with thespindle 36, and a fastener 44, which will be described in greater detail below. Alever 46 is pivotable by a user to operate theclamping mechanism 20. - The
lever 46 is pivotable about apin 48, which defines a pivot axis C, between a clamping position (FIG. 2 ) and a release position (not shown). In the clamping position, thetool accessory 18 is secured, or clamped, to thetool holder 42. In the release position, the fastener 44 may be unthreaded from theplunger 38 to remove and/or exchange thetool accessory 18. Thelever 46 includes acam 50 for displacing theplunger 38. In the clamping position, thecam 50 does not engage theplunger 38. In the release position, thecam 50 engages theplunger 38 to displace theplunger 38 against the bias of thespring 40. A user may rotate thelever 46 about the pivot axis C, causing thecam 50 to engage and displace theplunger 38, which releases the clamping force applied to thetool accessory 18 and allows the fastener 44 and thetool accessory 18 to be removed. A user may then exchange thetool accessory 18 and thread the fastener 44 into theplunger 38 so that thetool accessory 18 reengages thetool holder 42. Once the fastener 44 is repositioned, a user can rotate thelever 46 back to the clamping position, permitting thespring 40 to rebound and displace theplunger 38 and the connected fastener 44 toward the pivot axis C, which applies a clamping force between thetool holder 42 and thetool accessory 18. -
FIGS. 3-5 illustrate avibration dampening assembly 54 for use with themulti-tool 10. Thevibration dampening assembly 54 attenuates vibration created by themulti-tool 10 during operation. In some embodiments, thevibration dampening assembly 54 may be coupled to thehousing 12 with a hose clamp, fasteners, or an adhesive. In other embodiments, thevibration dampening assembly 54 may be integrated with thehousing 12. As such, thevibration dampening assembly 54 may be coupled to the exterior of thehousing 12. In further embodiments, thevibration dampening assembly 54 may be disposed within the interior of thehousing 12. For example, thevibration dampening assembly 54 may be supported within thegear case 32. - As shown in
FIGS. 4 and 5 , thevibration dampening assembly 54 includes acase 58, acounterweight 62 disposed within thecase 58, twoend caps counterweight 62. Thecase 58 is generally cylindrical and includes afirst end 74 and asecond end 78 opposite thefirst end 74. Thecase 58 defines abore 82 that extends between the first and second ends 74, 78. Thecase 58 also includes abracket 86 that may be used to mount thevibration dampening assembly 54 to thehousing 12. Alternatively, in some embodiments, thecase 58 may be integrally formed with the clamshell halves 24 a, 24 b or omitted entirely with thecounterweight 62 being suspended within thehousing 12. In some embodiments, thecase 58, end caps 66 a, 66 b, and/or thecounterweight 62 may be produced using an additive manufacturing process, such as 3D printing, and may be made from plastic, metal, or other suitable materials. - With continued reference to
FIG. 4 , thecounterweight 62 is also generally cylindrical and defines a first end 90 and asecond end 94 opposite the first end 90. The first end 90 of thecounterweight 62 defines afirst spring seat 98 to receive an end of thespring 70 a and thesecond end 94 defines asecond spring seat 102 to receive an end of theother spring 70 b. Afirst end cap 66 a is coupled to thefirst end 74 of thecase 58 and asecond end cap 66 b is coupled to thesecond end 78 of thecase 58. As such, the first and second end caps 66 a, 66 b enclose thecounterweight 62 and springs 70 within thebore 82 of thecase 58. Eachend cap spring seat 106 that receives an end of one of thesprings case 58. - With reference to
FIG. 5 , thefirst spring 70 a is positioned between thespring seat 106 of thefirst end cap 66 a and thefirst spring seat 98 of thecounterweight 62. Thesecond spring 70 b is positioned between thespring seat 106 of thesecond end cap 66 b and thesecond spring seat 102 of thecounterweight 62. Thecounterweight 62 reciprocates along an axis D, which is perpendicular to both of the axes A, B. In addition, the axis D is parallel with the pivot axis C. - The
first spring 70 a biases thecounterweight 62 in a first direction, whereas thesecond spring 70 b biases thecounterweight 62 in a second direction that is opposite the first direction. The first andsecond springs counterweight 62 is biased towards a neutral position between the end caps 66 a, 66 b when themotor 14 is in the “off” state and thetool accessory 18 is not oscillating. The first andsecond springs counterweight 62 within thebore 82 so that thecounterweight 62 can freely oscillate within thebore 82 without frictional contact with the interior of thecase 58. In addition, thecounterweight 62 includes a smaller diameter than thebore 82 of thecase 58 to inhibit thecounterweight 62 from contacting thecase 58. The mass of thecounterweight 62 and the stiffness of thesprings drive mechanism 16 and thetool accessory 18 when themotor 14 is in the “on” state. In further embodiments, thevibration dampening assembly 54 may include more than two springs. - During operation of the
multi-tool 10, in response to thedrive mechanism 16 and thetool accessory 18 being oscillated by themotor 14, vibration is created and translated to the operator through thehousing 12 and handleportion 26. However, thevibration dampening assembly 54 attenuates this vibration. Specifically, thedrive mechanism 16 converts a continuous torque input from themotor 14 to oscillating rotation of thedrive mechanism 16 andtool accessory 18 about the axis B. As torque is applied to thespindle 36, thetool holder 42, and thetool accessory 18 to incrementally rotate them about the axis B in a first rotational direction, a reaction torque is applied to thehousing 12 in an opposite, second rotational direction about axis B. Thespindle 36, thetool holder 42, and thetool accessory 18 then stop rotating in the first rotational direction, and their rotation is reversed to the second rotational direction. As thespindle 36, thetool holder 42, and thetool accessory 18 are rotated in the second rotational direction, a reaction torque is applied to thehousing 12 in the first rotational direction about axis B. The oscillating reaction torque applied to thehousing 12 creates the vibration felt by the user. - The
vibration dampening assembly 54 is offset from the axis B, with the reciprocating axis D of thecounterweight 62 oriented transverse to the axis B, to create equal and opposite moments about the axis B to counteract the reversing reaction torque applied to thehousing 12. As such, thecounterweight 62 reciprocates along the axis D out of phase with the oscillation of thedrive mechanism 16 and thetool accessory 18 to counteract the reversing reaction torque. Thesprings vibration dampening assembly 54 continually bias thecounterweight 62 toward a neutral position. The reciprocating movement of thecounterweight 62 reduces the magnitude of the vibration transmitted through thehousing 12 and handleportion 26 to the user as thespindle 36, thetool holder 42, and thetool accessory 18 oscillate. -
FIG. 6 illustrates acase 110 of a vibration dampening assembly in accordance with another embodiment. Thecase 110 is similar to thecase 58 but includes aslot 114 that extends into thebore 82. Theslot 114 ventilates the interior of thecase 110 to prevent accumulated air pressure from affecting reciprocation of thecounterweight 62. -
FIGS. 7-9 illustrate avibration dampening assembly 210, in accordance with another embodiment of the invention, for use with themulti-tool 10 ofFIG. 1 . Thevibration dampening assembly 210 is similar to thevibration dampening assembly 54 with like features being represented with like references numerals. Thevibration dampening assembly 210 includes acase 214, acounterweight 62, and first andsecond springs FIGS. 8 and 9 ). - With continued reference to
FIGS. 8 and 9 , thecase 214 includes an end cap 216 and aflange 218. Theflange 218 includes an indentation 222 that defines a spring seat 226 for thesecond spring 70 b. The end cap 216 includes an interior 230 (FIG. 9 ) having afirst cavity portion 234 and a second cavity portion 238 that has a smaller diameter than thefirst cavity portion 234. The second cavity portion 238 defines a spring seat 242 for thefirst spring 70 a. Both the end cap 216 and theflange 218 include a plurality ofbosses 246 extending from respective outer surfaces. Afastener 250 may be inserted through apertures in thebosses 246 to secure the end cap 216 to theflange 218. In the illustrated embodiment, thefasteners 250 include a threaded bolt and a nut. In other embodiments, different types of fasteners may be used. - With reference to
FIG. 9 , when assembled, thecase 214 defines an enclosed chamber 254 in which thecounterweight 62 and thesprings first spring 70 a is positioned between the spring seat 242 of theflange 218 and thefirst spring seat 98 of thecounterweight 62. Thesecond spring 70 b is positioned between the spring seat 226 of the end cap 216 and thesecond spring seat 102 of thecounterweight 62. Similar to thevibration dampening assembly 54, thefirst spring 70 a biases thecounterweight 62 in a first direction, whereas thesecond spring 70 b biases thecounterweight 62 in a second direction that is opposite the first direction. The first andsecond springs counterweight 62 is biased towards a neutral position between the spring seats 226, 242 when themotor 14 is in the “off” state. The first andsecond springs counterweight 62 within the second cavity portion 238 of thecase 214 so that thecounterweight 62 can freely oscillate within the second cavity portion 238 without frictional contact with the interior of thecase 214. In addition, thecounterweight 62 includes a smaller diameter than the second cavity portion 238 to inhibit thecounterweight 62 from contacting thecase 214. - During operation of the
power tool 10, in response to thetool accessory 18 being oscillated by themotor 14, vibration throughout thepower tool 10 is generated and translated to the operator through thehousing 12 and handleportion 26. However, thevibration dampening assembly 210 attenuates this vibration. Specifically, thedrive mechanism 16 converts a continuous torque input from themotor 14 to oscillating rotation of thedrive mechanism 16 and thetool accessory 18 about the axis B. As torque is applied to thespindle 36, thetool holder 42, and thetool accessory 18 to incrementally rotate them about the axis B in a first rotational direction, a reaction torque is applied to thehousing 12 in an opposite, second rotational direction about axis B. Thespindle 36, thetool holder 42, and thetool accessory 18 then stop rotating in the first rotational direction, and their rotation is reversed to the second rotational direction. As thespindle 36, thetool holder 42, and thetool accessory 18 are rotated in the second rotational direction, a reaction torque is applied to thehousing 12 in the first rotational direction about axis B. The oscillating reaction torque applied to thehousing 12 creates the vibration felt by the user. - The
vibration dampening assembly 210 is offset from the axis B, with the reciprocating axis D of thecounterweight 62 oriented transverse to the axis B, to create equal and opposite moments about the axis B to counteract the reversing reaction torque applied to thehousing 12. As such, thecounterweight 62 reciprocates along the axis D out of phase with the oscillation of thedrive mechanism 16 and thetool accessory 18 to counteract the reversing reaction torque. Thesprings vibration dampening assembly 210 continually bias thecounterweight 62 toward a neutral position. The reciprocating movement of thecounterweight 62 reduces the magnitude of the vibration transmitted through thehousing 12 and handleportion 26 to the user as thespindle 36, thetool holder 42, and thetool accessory 18 oscillate. - Various features and advantages are set forth in the following claims.
Claims (20)
1. A power tool comprising:
a housing;
a motor disposed within the housing and defining a first axis;
a tool holder driven to oscillate about a second axis by the motor, the second axis being perpendicular to the first axis; and
a vibration dampening assembly including a counterweight configured to reciprocate along a third axis perpendicular to both the first axis and the second axis in response to oscillation of the tool holder about the second axis.
2. The power tool of claim 1 , wherein the vibration dampening assembly further includes
a first spring adjacent a first end of the counterweight, and
a second spring adjacent an opposite, second end of the counterweight, and
wherein the first and second springs bias the counterweight toward a neutral position.
3. The power tool of claim 2 , wherein the first end of the counterweight defines a first spring seat to receive the first spring and the second end of the counterweight defines a second spring seat to receive the second spring.
4. The power tool of claim 1 , wherein the vibration dampening assembly further includes a case in which the counterweight is positioned.
5. The power tool of claim 4 , wherein the case is internally located within the housing or externally located of the housing.
6. The power tool of claim 4 , wherein the case includes a ventilation port configured to communicate an interior of the case in which the counterweight is located with the atmosphere outside the case.
7. The power tool of claim 4 , wherein the counterweight is enclosed within the case.
8. The power tool of claim 4 , wherein the case includes a bracket configured to mount the vibration dampening assembly to the housing.
9. The power tool of claim 1 , wherein the counterweight is produced using an additive manufacturing process.
10. The power tool of claim 1 , wherein the counterweight is cylindrical.
11. A power tool comprising:
a housing;
a motor disposed within the housing and defining a first axis;
a tool holder driven to oscillate about a second axis by the motor, the second axis being perpendicular to the first axis;
a drive mechanism configured to convert torque from the motor to an oscillating movement of a tool accessory received by the tool holder; and
a vibration dampening assembly including a counterweight configured to reciprocate along a third axis perpendicular to both the first axis and the second axis in response to oscillation of the tool holder about the second axis.
12. The power tool of claim 11 , wherein the housing defines a battery support portion configured to receive a battery pack to power the motor.
13. The power tool of claim 12 , wherein the battery support portion is positioned at a first end of the housing and the drive mechanism is positioned at a second end opposite the first end.
14. The power tool of claim 11 , wherein the housing defines a handle portion configured to be grasped by a user, and wherein the motor and the drive mechanism are positioned within the housing in front of the handle portion.
15. A power tool comprising:
a housing;
a motor disposed within the housing and defining a first axis;
a tool holder driven to oscillate about a second axis by the motor, the second axis being perpendicular to the first axis; and
a vibration dampening assembly including
a case supported by the housing,
a counterweight positioned within the case, the counterweight configured to reciprocate along a third axis perpendicular to both the first axis and the second axis in response to oscillation of the tool holder about the second axis,
a first spring arranged between the case and the counterweight, the first spring biasing the counterweight in a first direction, and
a second spring arranged between the case and the counterweight, the second spring biasing the counterweight in a second direction opposite the first direction;
wherein the first and second springs bias the counterweight toward a neutral position within the case.
16. The power tool of claim 15 , wherein a first end of the counterweight defines a first spring seat to receive the first spring and a second end of the counterweight opposite the first end defines a second spring seat to receive the second spring.
17. The power tool of claim 15 , wherein the vibration dampening assembly further includes a first end cap positioned adjacent a first side of the case and a second end cap positioned adjacent a second side of the case opposite the first side, the first and second end caps enclosing the counterweight within the case.
18. The power tool of claim 15 , wherein the counterweight is cylindrical.
19. The power tool of claim 15 , wherein the case includes a ventilation port configured to communicate an interior of the case in which the counterweight is located with the atmosphere outside the case.
20. The power tool of claim 15 , wherein the case includes a bracket configured to mount the vibration dampening assembly to the housing.
Priority Applications (1)
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US17/749,765 US20220388138A1 (en) | 2021-05-21 | 2022-05-20 | Oscillating multi-tool |
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US202163191565P | 2021-05-21 | 2021-05-21 | |
US17/749,765 US20220388138A1 (en) | 2021-05-21 | 2022-05-20 | Oscillating multi-tool |
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US20220388138A1 true US20220388138A1 (en) | 2022-12-08 |
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US17/749,765 Pending US20220388138A1 (en) | 2021-05-21 | 2022-05-20 | Oscillating multi-tool |
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WO (1) | WO2022246220A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI811170B (en) * | 2022-12-21 | 2023-08-01 | 廖建修 | Pneumatic extraction device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100307783A1 (en) * | 2007-12-17 | 2010-12-09 | Otto Baumann | Hand-held power tool, particularly a drilling and/or chisel hammer, having a damper unit |
US7938196B2 (en) * | 2009-04-17 | 2011-05-10 | Hilti Aktiengesellschaft | Hand-held power tool with vibration-compensating mass |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102009014970A1 (en) * | 2009-03-18 | 2010-09-23 | C. & E. Fein Gmbh | Oscillation tool with vibration damping |
WO2011000335A1 (en) * | 2009-07-03 | 2011-01-06 | 苏州宝时得电动工具有限公司 | Power tool |
DE102016215660A1 (en) * | 2016-08-22 | 2018-02-22 | Robert Bosch Gmbh | Hand tool and method for damping a hand tool |
DE202016105294U1 (en) * | 2016-09-23 | 2016-10-14 | Robert Bosch Gmbh | Vibration damping device for a portable power tool, in particular a drill and / or chisel hammer |
-
2022
- 2022-05-20 WO PCT/US2022/030283 patent/WO2022246220A1/en active Application Filing
- 2022-05-20 US US17/749,765 patent/US20220388138A1/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100307783A1 (en) * | 2007-12-17 | 2010-12-09 | Otto Baumann | Hand-held power tool, particularly a drilling and/or chisel hammer, having a damper unit |
US7938196B2 (en) * | 2009-04-17 | 2011-05-10 | Hilti Aktiengesellschaft | Hand-held power tool with vibration-compensating mass |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI811170B (en) * | 2022-12-21 | 2023-08-01 | 廖建修 | Pneumatic extraction device |
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